CN101674145B

CN101674145B - Data transmission method and apparatus thereof

Info

Publication number: CN101674145B
Application number: CN 200910206717
Authority: CN
Inventors: 孙巨揆; 马文凯
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-10-21
Filing date: 2009-10-21
Publication date: 2013-07-03
Anticipated expiration: 2029-10-21
Also published as: WO2010145594A1; CN101674145A

Abstract

The invention discloses a data transmission method for realizing data transmission in optical networks and saving resources. The method comprises the following steps: multiplexing service data on service channels into a channel of service data which comprises identifications of all the service channels; packaging the channel of service data into a plurality of GFP frames according to the identifications of the service channels, wherein, each GFP frame corresponds to the identification of a service channel; mapping a plurality of GFP frames to OTN frame channels respectively; multiplexing GFP frame data of a plurality of OTN frame channels into a channel of GFP frame data which comprises the identifications of the OTN frame channels; depackaging the channel of GFP frame data to obtain a channel of service data; dividing the channel of service data into a plurality of channels of service data according to the identifications of the OTN frame channels, and mapping to the service channels. The invention further discloses an apparatus for realizing the method.

Description

A kind of method and device that transmits data

Technical field

The present invention relates to computer and the communications field, particularly relate to method and the device of transmission data in optical-fiber network.

Background technology

This is the long-term general layout in Access Network market to access network technology to diversification evolution, optical access network in the long term, and especially EPON (PON) may be a kind of desirable solution.In various smooth access technologies, PON owing to adopt passive bus, lay low with operation expense, transparent and be easy to advantage such as upgrading and enjoy the industry concern to business.From the initial PON technology based on ATM(Asynchronous Transfer Mode), to based on the PON technology of Ethernet (Ethernet), general EPON (GPON) till now again, the proposition of PON standard has each time all promoted the fast development of access network technology.The GPON standard of the passive architecture of new generation that recent International Telecommunication Union passes through, up-downgoing speed is brought up to 2.5Gb/s, and adopted Generic Framing Procedure (Generic Framing Procedure, GFP) agreement encapsulates, and more effective support comprises such as value-added services such as speech, data service, video traffic, ecommerce, long-distance education, tele-medicines.

Optical transfer network (OTN) is one of developing direction of optical communication technique, and all client signals comprise that synchronous digital hierarchy (SDH), ATM, GFP and other signal all should be able to transmit in OTN.How these client signals are packed processing so that the technology that transmits is called digital wrapper technology in OTN.The mapping of GFP is to finish by the gfp frame with byte structure is left in ODUk (light path data cell) payload section by row.A gfp frame is made of a GFP head and a GFP payload section.

At present, multichannel business, especially data service in the scheme that optical transfer network transmits are: each road independent GFP mapping block of professional process is carried out the GFP package, be mapped on the corresponding OTN transport service passage again and transmit; Separating the mapping direction, for each road OTN transport service passage, also separate mapping block with independent GFP and unpack, send to then on each road service channel.The shortcoming of this scheme is, for each road client's business, all used independently GFP mapping to conciliate mapping block, if the plate level inserts multichannel client business, so just need there be a plurality of separate GFP mappings to conciliate mapping block, like this with field programmable gate array (FPGA) when realizing, the occupancy of its logical resource can be along with the increase of the professional way of client at double growth, cause fpga logic resource anxiety.

Summary of the invention

The embodiment of the invention provides a kind of method and device that transmits data, is used for being implemented in optical-fiber network and transmits data, and save resource.

A kind of data may further comprise the steps through the method that GFP is mapped to OTN:

Business datum on each service channel is multiplexed into one tunnel business datum, and wherein this one tunnel business datum comprises the sign of each service channel;

According to the service channel sign one tunnel business datum is packaged into a plurality of gfp frames, wherein the corresponding service channel sign of each gfp frame;

A plurality of gfp frames are mapped to each OTN frame passage respectively.

A kind of multichannel gfp frame data may further comprise the steps to the method for the solution mapping of business datum:

The gfp frame data of a plurality of OTN frame passages are multiplexed into one road gfp frame data, and these one road gfp frame data comprise OTN frame gap marker;

One road gfp frame data are carried out decapsulation, obtain one tunnel business datum;

According to OTN frame gap marker one tunnel business datum is decomposed into the multichannel business datum, and solution is mapped to each service channel.

A kind of for data through the device that GFP is mapped to OTN, comprising:

Multiplexing module is used for the business datum on each service channel is multiplexed into one tunnel business datum, and wherein this one tunnel business datum comprises the sign of each service channel;

Package module is used for according to the service channel sign one tunnel business datum being packaged into a plurality of gfp frames, wherein the corresponding service channel sign of each gfp frame;

Divide and use module, be used for a plurality of gfp frames are mapped to each OTN frame passage respectively.

A kind of for the device of multichannel gfp frame data to the solution mapping of business datum, comprising:

Multiplexing module is used for the gfp frame data of a plurality of OTN frame passages are multiplexed into one road gfp frame data, and these one road gfp frame data comprise OTN frame gap marker;

Decapsulation module is used for one road gfp frame data are carried out decapsulation, obtains one tunnel business datum;

Divide and use module, be used for according to OTN frame gap marker one tunnel business datum being decomposed into the multichannel business datum, and solution is mapped to each service channel.

The embodiment of the invention is multiplexed into one tunnel business datum with the multichannel business datum in mapping process, only need a package module that this one tunnel business datum is packaged into gfp frame, it is mapped to OTN frame passage again.In separating mapping process, also only need a decapsulation module to come gfp frame is carried out decapsulation.The corresponding package module of a plurality of service channels and a decapsulation module in the embodiment of the invention, the corresponding a plurality of OTN frame passages of this package module and decapsulation module simultaneously.FPGA only need realize the function of a package module and a decapsulation module, thereby has saved the logical resource of FPGA.

Description of drawings

Fig. 1 is mapped to the main method flow chart of OTN through GFP for data in the embodiment of the invention;

Fig. 2 is the primary structure figure of device 200 in the embodiment of the invention;

Fig. 3 is the detailed structure view of device 200 in the embodiment of the invention;

Fig. 4 is mapped to the method detailed flow chart of OTN through GFP for data in the embodiment of the invention;

Fig. 5 is the main method flow chart that multichannel gfp frame data are shone upon to the solution of business datum in the embodiment of the invention;

Fig. 6 is the primary structure figure of device 600 in the embodiment of the invention;

Fig. 7 is the detailed structure view of device 600 in the embodiment of the invention;

Fig. 8 is the method detailed flow chart that multichannel gfp frame data are shone upon to the solution of business datum in the embodiment of the invention.

Embodiment

Referring to Fig. 1, data are as follows through the main method flow process that GFP is mapped to OTN in the present embodiment:

Step 101: the business datum on each service channel is multiplexed into one tunnel business datum, and wherein this one tunnel business datum comprises the sign of each service channel.

Step 102: according to the service channel sign one tunnel business datum is packaged into a plurality of gfp frames, wherein the corresponding service channel sign of each gfp frame.

Step 103: a plurality of gfp frames are mapped to each OTN frame passage respectively.

Present embodiment provides a kind of and is mapped to the device 200 of OTN for data through GFP, and referring to shown in Figure 2, it comprises: first Multiplexing module 201, package module 202, first minute are with module 203.

First Multiplexing module 201 is used for the business datum on each service channel is multiplexed into one tunnel business datum, and wherein this one tunnel business datum comprises the sign of each service channel.Concrete, first Multiplexing module 201 is multiplexed into one tunnel business datum by polling mode with the business datum on each service channel, the business datum of the sign+service channel 2 of the business datum+service channel 2 of the sign+service channel 1 of one tunnel business datum such as service channel 1 etc.

Package module 202 is used for according to the service channel sign one tunnel business datum being packaged into a plurality of gfp frames, wherein the corresponding service channel sign of each gfp frame.The business datum of a service channel may be packaged into one or more gfp frames.Package module 202 is encapsulated in the service channel sign in Channel Identifier (CID) territory of gfp frame head.

Be used for a plurality of gfp frames are mapped to each OTN frame passage respectively with module 203 in first minute.Because service channel and OTN frame passage are one-to-one relationships, identified according to the service channel in the gfp frame with module 203 in first minute gfp frame is mapped to OTN frame passage.

Device 200 also comprises first buffer 204, and referring to shown in Figure 3, first buffer 204 is connected with a service channel, is used for buffer memory one tunnel business datum.When the length of gfp frame fixedly the time, first Multiplexing module 201 judges whether the business datum in first buffer 204 is not less than the length of gfp frame, is that business datum in first buffer 204 that is is multiplexed into one tunnel business datum with satisfying judged result.Can not process for the business datum in first buffer 204 not for judged result.Or earlier multiplexing judged result is business datum in first buffer 204 that is, and multiplexing judged result is the business datum in first buffer 204 not again.

Device 200 comprises that also 205, one second buffers 205 of second buffer are connected with an OTN frame passage, for buffer memory from first minute with the gfp frame of module 203 and be forwarded to OTN frame passage.

Device 200 comprises that also 206, one rate adapted modules 206 of rate adapted module are connected with an OTN frame passage with second buffer 205, is used for when second buffer, 205 no gfp frames, generates idle frame and is mapped to OTN frame passage.When in second buffer 205 gfp frame being arranged, the gfp frame in second buffer 205 is mapped to OTN frame passage.The frame transmission rate that rate adapted module 206 is used on the control OTN frame passage is constant, and transmission continuously.

Referring to Fig. 4, data are as follows through the method detailed flow process that GFP is mapped to OTN in the present embodiment:

Step 401: first buffer 204 receives the business datum on the service channel and preserves.

Step 402: first Multiplexing module 201 judges in first buffer 204 of current business passage whether enough business datums are arranged, if having, then continues step 403, otherwise the business datum in this first buffer 204 is not handled, and continues step 405.Whether there are enough business datums to refer to whether business datum satisfies the regular length of gfp frame, if satisfy, enough business datums then arranged, otherwise do not have enough business datums.If the length of gfp frame is unfixing, then can omit this determining step, directly carry out step 403.

Step 403: first Multiplexing module 201 is read business datum and is transmitted to package module 202 from first buffer 204.If the length of gfp frame is fixed, then first Multiplexing module 201 is read business datum according to the length of gfp frame from first buffer 204, and the length of the business datum of namely reading is the integral multiple of the length of gfp frame.And the business datum of reading carries the sign of service channel.

Step 404: 202 pairs of business datums of receiving of package module encapsulate, and obtain gfp frame.Continue step 406.

Step 405: first Multiplexing module 201 determines that next service channel is the current business passage, and continues step 402.

Step 406: package module 202 sends to first fen with module 203 with gfp frame.

Step 407: first minute with module 203 according to the service channel in the gfp frame sign corresponding relation with OTN frame gap marker, gfp frame is sent to second buffer 205 of OTN frame gap marker correspondence.

Step 408: second buffer 205 receives gfp frame and preserves.

Step 409: rate adapted module 206 judges in second buffer 205 whether gfp frame is arranged, and then continues step 410 if having, otherwise continues step 411.

Step 410: rate adapted module 206 is mapped to OTN frame passage with gfp frame.

Step 411: rate adapted module 206 generates idle frame and is mapped to OTN frame passage.

In step 402, first Multiplexing module 201 is judged when not having enough business datums in certain first buffer 204, this first buffer 204 of mark.Judged after one time at 201 pairs of first all buffers 204 of first Multiplexing module, business datum in first buffer 204 of mark has been carried out multiplexing process.Perhaps, first Multiplexing module 201 is judged when not having enough business datums in certain first buffer 204, generates idle (Idle) frame to fill the length of business datum, makes it satisfy the length of gfp frame.

More than introduced mapping process, relative, present embodiment provides the implementation procedure of separating mapping.

Referring to Fig. 5, multichannel gfp frame data are as follows to the realization flow of the main method of the solution mapping of business datum in the present embodiment:

Step 501: the gfp frame data of a plurality of OTN frame passages are multiplexed into one road gfp frame data, and these one road gfp frame data comprise OTN frame gap marker.

Step 502: one road gfp frame data are carried out decapsulation, obtain one tunnel business datum.

Step 503: according to OTN frame gap marker one tunnel business datum is decomposed into the multichannel business datum, and solution is mapped to each service channel.

Referring to Fig. 6, be used in the present embodiment realizing that multichannel gfp frame data comprise to the device 600 of the solution mapping of business datum:

Second Multiplexing module 601 is used for the gfp frame data of a plurality of OTN frame passages are multiplexed into one road gfp frame data, and these one road gfp frame data comprise OTN frame gap marker.Each gfp frame data all carries OTN frame gap marker.Second Multiplexing module 601 is multiplexed into one road gfp frame data by polling mode with the gfp frame data of a plurality of OTN frame passages.

Decapsulation module 602 is used for one road gfp frame data are carried out decapsulation, obtains one tunnel business datum.

Be used for according to OTN frame gap marker one tunnel business datum being decomposed into the multichannel business datum with module 603 in second minute, and solution is mapped to each service channel corresponding with OTN frame gap marker.

Device 600 also comprises the 3rd buffer 604, referring to shown in Figure 7.The 3rd buffer 604 is connected with an OTN frame passage, is used for buffer memory gfp frame data.Second Multiplexing module 601 is read the gfp frame data and is multiplexed into one the tunnel from the 3rd buffer 604.

Device 600 comprises that also 605, one the 4th buffers 605 of the 4th buffer are connected with a service channel, is used for the business datum solution is mapped to the corresponding service passage.

Referring to Fig. 8, multichannel gfp frame data are as follows to the realization flow of the method detailed of the solution mapping of business datum in the present embodiment:

Step 801: the 3rd buffer 604 receives the gfp frame data on the OTN frame passage and preserves.

Step 802: second Multiplexing module 601 is read the gfp frame data from the 3rd buffer 604 of current OTN frame passage correspondence, and sends to decapsulation module 602.

Step 803: the gfp frame data that 602 pairs of decapsulation module are received are carried out decapsulation, and obtain business datum, send to second fen with module 603.Business datum comprises and OTN frame gap marker corresponding service gap marker.

Step 804: second minute with module 603 according to the service channel in business datum sign, business datum is distributed to the 4th corresponding buffer 605 of service channel sign.By the 4th buffer 605 to the service channel service data transmission.

Step 805: second Multiplexing module 601 as current OTN frame passage, and continues step 802 with next OTN frame passage.

Second Multiplexing module 601 is before read data, should judge also whether the data in the 3rd buffer 604 have been filled with a complete gfp frame, if, then carry out step 801, if in current the 3rd buffer 604 storage data complete gfp frame not enough, carry out step 805 so.

Be used for realizing that the software of the embodiment of the invention can be stored in storage mediums such as floppy disk, hard disk, CD and flash memory.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. data are mapped to the method for OTN through GFP, it is characterized in that, may further comprise the steps:

According to described service channel sign, by a package module, this one tunnel business datum is packaged into a plurality of gfp frames, wherein the corresponding service channel sign of each gfp frame;

Described a plurality of gfp frames are mapped to each OTN frame passage respectively;

Wherein, when the length of described gfp frame fixedly the time, and when the Jiang Yilu business datum is packaged into that business datum does not satisfy the length of gfp frame in a plurality of gfp frame processes, generate idle frame to fill described gfp frame;

When the length of gfp frame fixedly the time, the business datum on each service channel is multiplexed into before one tunnel business datum, judge whether the business datum on the service channel is not less than the length of described gfp frame; The step that business datum on each service channel is multiplexed into one tunnel business datum comprises: the business datum that will satisfy judged result and be on the service channel that is is multiplexed into one tunnel business datum.

2. the method for claim 1 is characterized in that, when no gfp frame is mapped to OTN frame passage, generates idle frame and is mapped to OTN frame passage.

3. the method that multichannel gfp frame data are shone upon to the solution of business datum is characterized in that, may further comprise the steps:

By a decapsulation module one road gfp frame data are carried out decapsulation, obtain one tunnel business datum;

4. one kind is used for data and is mapped to the device of OTN through GFP, it is characterized in that, comprising:

Divide and use module, be used for a plurality of gfp frames are mapped to each OTN frame passage respectively;

Wherein, also comprise first buffer, be connected with a service channel, be used for buffer memory one tunnel business datum; When the length of gfp frame fixedly the time, Multiplexing module judges whether the business datum in first buffer is not less than the length of gfp frame, is that business datum in first buffer that is is multiplexed into one tunnel business datum with satisfying judged result;

Wherein, also comprise second buffer, be connected with an OTN frame passage, be used for buffer memory from minute with the gfp frame of module and be forwarded to OTN frame passage.

5. device as claimed in claim 4 is characterized in that, also comprises the rate adapted module, is connected with an OTN frame passage with second buffer, is used for when the no gfp frame of second buffer, generates idle frame and is mapped to OTN frame passage.

6. one kind is used for multichannel gfp frame data to the device of the solution mapping of business datum, it is characterized in that, comprising: